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Information

Mass
Master

Real
Name: Jack PowerOccupation: Student (elementary school)Identity: SecretLegal Status: Citizen of the United States with no criminal
record, still a minor Place of Birth: Richmond, Virginia Marital Status: SingleKnown Relatives: James (father), Margaret (mother), Alex
(brother), Julia, Katie (sisters), Roy Craig (grandfather) Group Affiliation: Power Pack Base of Operations: New York CityFirst Appearance: POWER PACK #1

History: Jack Power is the younger son of Dr.
James Power, a physicist who was working for the United
States government on a means of producing large quantities
of energy cheaply through combining matter and antimatter.
(The subatomic particles composing antimatter have opposite
charges of those of the equivalent particles of matter.
When matter contacts antimatter, both are converted entirely
into vast quantities of energy)

An alien Kymellian named Aelfyre Whitemane (nicknamed "Whitey")
learned of Dr. Power's discovery and intended to stop
it from being used. Whitemane knew that a device such
as Power's, although Power did not realize it, would trigger
a chain reaction that would destroy the Earth. Moreover,
he knew that Power's device was sought by the alien Z'nrx,
nicknamed "Snarks,"
who intended to use it to conquer inhabited worlds.

Snarks captured Dr. Power and his wife Margaret,
intended to force him to reveal the secret of his device.
Whitemane saved the Powers' children, Alex, Julie, Jack,
and Katie, from being
captured, but he himself was fatally wounded in the process.
Dying, Whitemane transferred a different one of his superhuman
powers into each of the four Power children, and asked
them to use their new abilities to save their world.

Jack received the power to alter the density of his body's
mass, and therefore called himself Mass Master. The four
children called themselves the Power
Pack. Power Pack thwarted the Snarks, rescued their
parents, and destroyed Dr. Power's dangerous antimatter
converter, thereby saving the Earth from destruction.
The four children have since continued to have adventures
as Power Pack.

During his brother Alex's time with the New Warriors, he "borrowed"
all his siblings' powers against their wishes. And yet
during a New Warriors' mission, where the Smartship
Friday was nearly sacrificed in order to stop the
Dire Wraith Queen Volx and the Neo-Neutralizer weapon
almost cancelled all of the Warriors' powers, Alex inadvertently
returned the powers back to the Power Pack.

The Power Family have recently moved to Bainbridge Island,
approximately ten miles away from the city of Seattle,
Washington.

Height: 4 ft. 5 in. Weight: 66 lbs. Eyes: Blue Hair: Brown

Strength Level: Mass Master possesses the normal human
strength of a boy of his age, height, and build, who engages
in a normal amount of exercise for his age (mostly through
playing).

Known Superhuman Powers: Mass Master can alter the level
of density of the mass of his body through an act of will.
His control over his density does not operate in the same
manner as the Vision's similar power. Unlike the Vision,
Mass Master cannot become intangible or diamond-hard,
nor can he increase his weight beyond its normal level.
Moreover, the Vision retains his normal size throughout
all his density changes, whereas Mass Master does not.

Instead, by mentally expanding the amount of space between
the molecules of his body, Mass Master takes on gaseous
form. His consciousness remains intact when he is in this
form and continues to control his body in gaseous form.
Mass Master can expand his size to gigantic proportions.
He can also float and fly in the air when he is in gaseous
form. Apparently Mass Master does not need to ride air
currents to move through the air, but it is unclear exactly
how he propels himself forward. In his gaseous form solid
objects pass through him harmlessly; however, he cannot
carry solid objects when he is in this form. Mass Master's
gaseous form is cloudlike, and he can make himself resemble
a dense fog so as to conceal his teammates. Mass Master
usually maintains his normal human shape (at least or
the upper portion of his body) when he is in gaseous form,
but he can alter this form's appearance. He can also maintain
control over his entire gaseous substance if portions
of it become separated from him.

By mentally reducing the amount of space between his body's
molecules, Mass Master can shrink in size to a height
of only several inches. Mass Master thus compressed this
full mass into a very small volume. His body is harder
and thus more resistant to injury when he is at this size.
At this size, by jumping atop an adversary, Mass Master
creates his "jackhammer" effect: the adversary
feels the entire weight of a young boy hit him atop a
very small area of his body, and the sudden impact usually
knocks down the victim.

Paraphernalia: Mass Master wears a special costume created
by the Kymellian smartship Friday from unstable molecules.
The costume shrinks and expands in size as Mass Master
does, and turns gaseous and solid when he does.

The costume usually occupies another dimension, but Mass Master
can mentally command it to materialize on his body in
this dimension, and simultaneously shift his normal clothing
to the other dimension. He can also mentally reverse this
process.